Accounting firms handle concentrated volumes of sensitive information, including tax IDs, payroll data, financial statements, bank details, and authentication credentials. That concentration makes firms a consistent target for phishing, ransomware, business email compromise, and credential theft.
A single incident can trigger data exposure, operational downtime, regulatory scrutiny, and long-term trust erosion. Cybersecurity is therefore a professional obligation, not a technical add-on. The checklist below helps CPAs and accounting firm leaders assess whether their controls align with current risks and regulatory expectations.
Standard email does not provide sufficient protection for transmitting tax returns, W-2s, or banking information. Require encrypted email or a secure client portal for all sensitive exchanges.
Look for platforms that support two-way secure file sharing, access controls, and audit logs so you can verify who accessed what and when.
Passwords alone no longer provide adequate protection. Multi-factor authentication reduces the risk of account takeover by requiring a second verification factor.
Apply MFA to email accounts, accounting and tax software, cloud storage platforms, and any remote access tools such as virtual desktops or VPNs. For IRS guidance on protecting taxpayer data, see IRS Publication 4557.
Unpatched systems are a common entry point for attackers. Maintain consistent update schedules for operating systems, tax software, practice management tools, firewalls, and antivirus solutions.
If manual tracking is unreliable, use automated patch management to reduce exposure windows and document update compliance.
Every endpoint is a potential attack surface, including desktops, laptops, tablets, and mobile phones. Protect devices with antivirus software, host-based firewalls, disk encryption, and device compliance policies.
For mobile and remote endpoints, use mobile device management tools that support remote lock and wipe if a device is lost or stolen.
Human error remains a leading cause of breaches. Provide recurring training on phishing detection, password hygiene, social engineering tactics, and secure data handling.
Reinforce training with simulated phishing tests to measure awareness and improve response behavior over time.
Ransomware and system failures can make client data unavailable when you need it most. Implement automated backups that are encrypted, stored offsite, and tested for successful restoration.
A common baseline is the 3-2-1 strategy: three copies of data, on two different media types, with one copy stored offsite or offline.
Limit access based on job responsibilities. Staff should only access the client data required for their role. Review permissions regularly and immediately disable access for departing employees or contractors.
RBAC reduces both accidental exposure and the impact of compromised credentials.
Hybrid and remote work increase flexibility but also expand the attack surface. Require secure remote access methods such as business-grade VPNs, enforce MFA for all remote logins, and prohibit sensitive work over public Wi-Fi.
Audit remote access logs to identify unusual login times, locations, or session behavior.
Vendors that handle or store client data can introduce risk. Before onboarding, review vendor security practices, including encryption standards, data retention policies, and breach notification procedures.
Where applicable, request independent assurance such as SOC 2 reports or ISO 27001 certification. Vendor risk is explicitly addressed in the FTC Safeguards Rule.
Accounting firms may be subject to multiple regulatory requirements depending on jurisdiction and services provided. Common examples include the Gramm-Leach-Bliley Act for financial institutions, the FTC Safeguards Rule, IRS Publication 4557, and state privacy laws such as the California Consumer Privacy Act.
Review regulatory obligations annually and document how your security controls meet those requirements. For GLBA context, see Gramm-Leach-Bliley Act overview.
Cybersecurity for accountants is not only about preventing breaches. It is about protecting client relationships, maintaining compliance, and preserving the firm’s reputation. Each control in this checklist reduces the likelihood and impact of incidents that can disrupt operations and damage trust.
Revisit this checklist as your firm grows, adopts new technology, or expands remote work. Security maturity should evolve alongside the business.
Phishing, ransomware, business email compromise, and credential theft are the most common threats. These attacks often target email and remote access systems to reach financial data.
While not always explicitly mandated, MFA is strongly recommended by regulators and industry guidance, including IRS Publication 4557. Many cyber insurance policies also require MFA for coverage.
Backups should run at least daily for critical systems. They should be encrypted, stored offsite, and tested regularly to confirm data can be restored successfully.
Common frameworks include the Gramm-Leach-Bliley Act, the FTC Safeguards Rule, IRS Publication 4557, and applicable state privacy laws. Requirements vary based on firm size, services, and client base.
Start with high-impact controls such as MFA, secure email, device protection, and staff training. Standardized cloud security tools and managed services can reduce cost and complexity.
Third-party vendors often access or store client data. Weak vendor controls can expose your firm even if your internal security is strong. Regulators increasingly expect documented vendor oversight.